Fire-tubs boiler



` .1. n. MAC'LACHLAN.

FIRE TUBE OILER. Y APPLICATION mn MAY 7. ma.

lNVENTOFi Patented May 20, 1919. 2 SHEETS-SHEET I.

I Il I H H Hl-l H Il H H IIFH lIl Il H Il `H H H WITNESSES J.D.MAdACHLAN FIRE TUBE BOILER.v

APPucAnoN ruin MAY1.191&

Patent@ ,20,1919

2 SHE HEET 2.

narran sfrarras Partnr cierren.

JOHN D. MACLACHLAN, 0F CHADWICK, MISSOURI.

FIRE-TUBE BOILER.

Application filed May 7. 1918.

To all whom 'it may concern:

Be it known that I, JOHN D. MacLacH- LAN, a citizen ofthe United States, residing at Chadwick, in the county of Christian and State of Missouri, have invented certain new and useful Iniproveinents in Fire-Tube Boilers, of which the following is a specification.

This invention relates to water heaters, and more especially to water tube boilers of the internal fire tube type; and the object of the same is to'increase the heating capacity of a boiler of this type.

'Another object is to provide for expansion and contraction, and yet another object is to provide a support for the tubular boiler within its casing.

Yet other objects will appear in the following specification and claim, and reference is made to the drawings herewith and in which:

Figure 1 is a section through the casing and an elevation of the boiler, partly broken away,

Fig. 2- is a horizontalsection on the line 2 2 of Fig. 1. l

Fig. 3 is a plan of one annulus,

Fig. 4 is a plan of the disk,

Fig. 5 is an enlarged section of one of the compound tubes, made up of an external water pipe and an internal flue.

While this boiler yet to be described may be incased in masonry or in metal with or without a jacket, for purposes of illustration I have shown :inupright cylindrical casing or shell S having a. grate Gr at its lower end and an outlet O at its upper end t'or the products of combustion. I would not be limited in this particular, nor in the exact construction of parts as yet to be described. nor in fact to the vertical dispositions of the tubes, as they might be horizontal or otherwise. The water feed pipe is indicated at F, the steam dome at D, and the main steam outlet pipe at M. An indicator I is shown in the form of` a water glass wherer in may be seen the level of the water in the boiler at any time. There may be other attachments such as a pressure gage, but these details are not necessary of amplification.

Coming now to the present invention, I provide upper and lower hollow headers 1 and 2 supported by brackets S within the shell S and preferably connected b v long bolts or rods 4 so as to hold them in proper spaced relation. Each of the headers coinprises upper and lower sections formed with Specification of Letters Patent.

Patented May 2Q, 1911.9.

serial No. 233,120.

outer abutting flanges which are pierced to receive the rods 4 upon which are mounted pairs of nuts 4a between which the sections of the respective headers are clamped. The rods 4, besides serving as clamping means for the sections of the headers act as ties to connect the headers and secure them to the brackets 3 which form supporting means therefor. The feed pipe F opens into the bottom of the lower header and may also be used for clean-out. purposes. From the renter of the upper header a pipe leads into the steanr dome as shown. These headers are preferably circular, and they are connected with each other at their centers by a comparatively large water pipe through' which the circulation will be 'downward as indicated by the arrows. The gist of my invention, however, lies in connecting the contiguous walls of the headers by a series of water pipes 6, and connecting the relatively; outer sides of the two headers by a series of Vtubes 7 'smaller than the tubes 6 and constitilting tlues. 'Iheir lower ends are-open at S to receive the heat rising from the fire uponA the grate, and their upper ends 9 open into the space beneath the steam dome, around which pass the products of combustion to the outlet O. Between theI exterior of the flues 7 and the interior of the pipes is a relatively thin annular space 10 through which the water flows from the lower header upward into the upper header, returning down the central pipe 5 as the arrows indicate. Manifestly this thin tube of water (if I may call it such) is intensely heated by the products of combustion pass-1 ing upward through the internal flue, beside which tongues of flame may pass around the edges of the lower header and through the spaces l1 between the several Water pipes 6, as I do not let them contact with each other exteriorly. I may say that no tube -is in contact with any other tube, and.

therefore,`I provide for expansion and con-.

traction under varying conditions of heat. The water 'pipesare headed into the innerplates of the headers, and the flues are headed through the outer plates thereof. If the parts are built'substantially on the propor- .tion shown (although I do not wish to be limited in this particular) I have foundl by experiment that the circulation is so rapid that scale cannot collect in the tubular water space between the two pipes. Also the bore of the flue is so ample that the accumulation lio a resrt Y- ders may be Supp( u liras wir tha shell il. n a6' fon r' eau: for spa lli@ 3 hat A?,

zippropriae l 0 which e sllfll. 5;"

es ab some iiiezms Gr Keeping flue, pipes separated from @asili otlmr so t0 permit the passage heat the aces 1l, whence it ,f w :e walls ille pipa* 6 imilm: Waller, Spacn l0, En or ler micenivr@ pipes cqualv Smead o ivi'irdlsizo keep die iles a@ the ipes may provide one or fie ailier with ribs is Shown at 2! in fliig. Cl h@ Sam@ prfijectii ribs may be Continued tliroi gliout the lengLlr of the pig-es or f if posed at intervals as de sred, but would not mala@ the tip Gr ridge of the rib ccnacs with the adjacent @lemmi so closely one '1f/ub@ or pipe could not 40 be Withdrawn frm the @than This or broom@ riss z what may be, Csm v il, or approved form o" iifm. lli lo bf; undersloofl ilmi; muy nml@ duch clizm'j in construction and arrmigcimani mul coixlbimiil'ion of palais, materials, lliiiiifiisimis, ci cetera, is may prov@ Wyilimi uml ,i'zill wiiliin Clie scape uli' the appended Claim.

Having; illus fully dfescriliil iij; inve;- limi7 wlmi. 'l claim as new amil desir@ s-ecure by Lemmi Pixteiizr 2r Water illic lmilier, Cmnprising zin upright czifjiiig, lyrzuzlfs xlruling inwardly from the walls 0l alle Casing al; different el@- mtions? upper und lower lieuddrs, @ich @if lmdjiug upper und lower. sections formed willi abutting Einiges.; roils forming ties bsizwcmi the lieaiilers unil connecting them to lli@ lowQrmost sasl of bruclicts, mitts on the rods clnmikilng iil'ife sccimis of the regg-active headers and summing them lo the lower nostlu'ziclits, Waller pipen uoiuicvliiig' al-lil; water spaces of lili@ limnrs, limbes pa ng tliimugli. die Waier pipes und Mailers :md secured 10 lili@ Quim' wills of the lzi'ur, :miauilzir disks slipportiieil upon tlm upper brackets :md lim'- ing;` the matar imi'icx pip amd ille tie raids passing frl'irlirmigh and :in iul'iirlimliziu disk having lili@ inner wziiir pipes passing tl'icrviillr'ougli :im suiporil 'therwr .n aefrtimony wlmfwf :iix my signature in presence of iwi) Wiinesses.

JHN i/ACLCHL@ Vitnesses E, Cnrrrfiiobz'r, A. D. SMQY. 

